在一个闭合电路中,外电路电压
,内电压
.求电源电路中移送2C电荷量时,消耗的电能、电源内部产生的热能和外电路电场力做的功.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f91574437283852136e7f17c4b8199b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/064fd1abf301df6891f291b1806267df.png)
更新时间:2020-01-03 15:37:07
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【知识点】 计算电源的输出电压、总功率、输出功率、效率
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解答题
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较易
(0.85)
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【推荐1】如图所示的电路中,电阻R2=15Ω,R3=10Ω,电源的电动势E=12V,内电阻r=1Ω,安培表的读数.I=0.4A求:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/7/4264b008-93d9-41d5-8b38-af7d71ebdf39.png?resizew=176)
(1)流过电阻R1的电流是多少?
(2)电阻R1的阻值是多大?
(3)电源的输出功率是多少?
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/7/4264b008-93d9-41d5-8b38-af7d71ebdf39.png?resizew=176)
(1)流过电阻R1的电流是多少?
(2)电阻R1的阻值是多大?
(3)电源的输出功率是多少?
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解答题
|
较易
(0.85)
【推荐2】如图所示,电路中电阻![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
,电源的内电阻
,灯泡L上标有“3V 0.25A”的字样,闭合开关S,灯泡正常发光.求:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/2c509878-782b-4fbf-8b01-11f5c2305dee.png?resizew=228)
(1)灯泡的功率;
(2)电源的电动势;
(3)电源的总功率;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a263407a4be3c63a26c505470768685a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2f8381227707d92c615b5cb70d3fbb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/2c509878-782b-4fbf-8b01-11f5c2305dee.png?resizew=228)
(1)灯泡的功率;
(2)电源的电动势;
(3)电源的总功率;
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